CN2665670Y - Control point strip for measuring - Google Patents

Abstract

Disclosed is a control point strip, comprising a strip. The utility model is characterized in that: 2 to 10 control points are marked on the strip on which end arranged a connector connected to a support frame. The utility model has advantages that: the control point strip is arranged near a camera station instead of on or around the object, which can assist implementation of recent control and remote measurement.

Description

Measuring reference mark bar

Technical field

The utility model relates to a kind of measuring reference mark bar, in particular for photogrammetric reference mark bar.

Background technology

One of photogrammetric basic problem is the orientation of photograph.According to the photography principle of geometric reverse,, at first must know the inside and outside element of orientation of photograph in order to rebuild scalable how much stereoscopic models.For a long time, the elements of interior orientation of photograph mainly is to adopt physical method to demarcate in the laboratory, the elements of exterior orientation of photograph then mainly relies on compensating computation and a large amount of reference mark and separates indirectly and ask, and these reference mark need be laid in testee surface or on every side, thereby require the operating personnel to bear instrument, make a difficult journey, and labour intensity is big, the cost height, automaticity is low, and the cycle is long, is difficult to sometimes meet the demands.Therefore, people never stopped the pursuit that reduces or be completely free of the photogrammetric work pattern of ground control point.

The utility model content

The utility model purpose provides a kind of measuring reference mark bar, and it can overcome the deficiency and auxiliary realization the " nearly control, the far away measurement " of above-mentioned prior art.

The technical scheme that realizes the utility model purpose is: a kind of measuring reference mark bar, have the bar body, and it is characterized in that: the bar body is marked with 2～10 reference mark, and the end of bar body is provided with the joint that is connected with bracing frame.

And the middle part at each reference mark is the laser-bounce sheet.

And, have the annular groove of locking bar body on the cylinder-shaped joint.

The technical program provides a kind of being located to take the photograph near the station rather than reference mark bar surperficial at testee or on every side, from taking the photograph station observation reference mark bar and testee, take pictures, at this moment on the photo that obtains, point on the bar of reference mark covers on the subject, be evenly distributed, as on testee, having arranged a lot of reference mark, we can be referred to as " virtual controlling point ", the reference mark function of its function and routine is identical, equally can be used to follow-up adjustment resolves, but do not need to climb on the object or around object owing to lay these " virtual controlling points ", so layout difficulty, labour intensity, activity duration all reduces greatly, the most important thing is to utilize this reference mark bar to realize real " contactless " measurement.Promptly reach nearly control, the purpose of measurement far away.

Description of drawings

Fig. 1 is a front view of the present utility model.

Fig. 2 is the partial rear view of Fig. 1.

Fig. 3 is the use principle figure of reference mark bar.

Embodiment

With reference to Fig. 1, Fig. 2, example of the present utility model is a kind of measuring reference mark bar, has bar body 1, it is characterized in that: bar body 1 is marked with 2～10 reference mark 2, and the end of bar body 1 is provided with the joint 4 that is connected with bracing frame.

Bar body 1 can be made by aluminium alloy; Support frame as described above can be to measure A-frame commonly used.

Further technical scheme can be: the middle part at each reference mark 2 is a laser-bounce sheet 3.This reflector plate 3 can be the reflecting material that adheres in addition on it, also can directly the middle part at this reference mark, bar body place be polished.

Further technical scheme can also be: the annular groove 5 that has locking bar body 1 on the cylinder-shaped joint.

Consider from relative accuracy, the precision of the calibration point on the Surveying Control Point bar is suitable with reference mark precision on measuring corresponding distant objects, that is to say if the relative accuracy of the calibration point on the Surveying Control Point bar is 1: 1000, so just be equivalent to us at body surface or to have laid precision on every side be 1: 1000 reference mark.It proves following (see figure 3):

Proof: relative accuracy and distance dependent, establishing the absolute precision of surveying the calibration point on the bar of reference mark is δ ₁, projecting to so on the testee, absolute precision then is δ ₂,

${\mathrm{\δ}}_2={\mathrm{\δ}}_1\·\frac{D}{d}$

At this moment relative accuracy is

$\mathrm{\ϵ}=\frac{{\mathrm{\δ}}_2}{D}=\frac{{\mathrm{\δ}}_1\·\frac{D}{d}}{D}=\frac{{\mathrm{\δ}}_1}{d}$

As seen identical with the relative accuracy of point on the bar of reference mark.

Obviously, those skilled in the art can carry out various changes and distortion to the utility model and not break away from spirit and scope of the present utility model.Like this, if these modifications and distortion belong in the scope of the utility model claim and equivalent technologies thereof, then the utility model also be intended to comprise these change and modification interior.

Claims (3)

1. a measuring reference mark bar has the bar body, it is characterized in that: the bar body is marked with 2～10 reference mark, and the end of bar body is provided with the joint that is connected with bracing frame.

2. reference mark according to claim 1 bar is characterized in that: the middle part at each reference mark is the laser-bounce sheet.

3. reference mark according to claim 1 and 2 bar is characterized in that: the annular groove that has the locking bar body on the cylinder-shaped joint.

Images